diff --git a/modoboa/admin/app_settings.py b/modoboa/admin/app_settings.py
index 7a8678e59..efe660930 100644
--- a/modoboa/admin/app_settings.py
+++ b/modoboa/admin/app_settings.py
@@ -51,6 +51,16 @@ ADMIN_EVENTS = [
 class AdminParametersForm(parameters.AdminParametersForm):
     app = "admin"
 
+    dom_sep = SeparatorField(label=ugettext_lazy("Domains"))
+
+    enable_dnsbl_checks = YesNoField(
+        label=ugettext_lazy("Enable DNSBL checks"),
+        initial="yes",
+        help_text=ugettext_lazy(
+            "Check every domain against major DNSBL providers"
+        )
+    )
+
     mbsep = SeparatorField(label=ugettext_lazy("Mailboxes"))
 
     handle_mailboxes = YesNoField(
diff --git a/modoboa/admin/management/commands/subcommands/_dnsbl.py b/modoboa/admin/management/commands/subcommands/_dnsbl.py
index c2819502e..ff8695334 100644
--- a/modoboa/admin/management/commands/subcommands/_dnsbl.py
+++ b/modoboa/admin/management/commands/subcommands/_dnsbl.py
@@ -11,6 +11,7 @@ from django.core.management.base import BaseCommand
 
 from modoboa.admin import constants
 from modoboa.admin import models
+from modoboa.lib import parameters
 
 
 class CheckDNSBLCommand(BaseCommand):
@@ -58,6 +59,9 @@ class CheckDNSBLCommand(BaseCommand):
             finally:
                 if address is not None:
                     ip_list.append(address)
+        print domain.name, ip_list
+        if len(ip_list) == 0:
+            return
         if not hasattr(settings, "DNSBL_PROVIDERS"):
             providers = constants.DNSBL_PROVIDERS
         else:
@@ -78,5 +82,7 @@ class CheckDNSBLCommand(BaseCommand):
 
     def handle(self, *args, **options):
         """Command entry point."""
+        if parameters.get_admin("ENABLE_DNSBL_CHECKS") == "no":
+            return
         for domain in models.Domain.objects.filter(enabled=True):
             self.check_domain(domain, options.get("timeout"))
diff --git a/modoboa/admin/models/domain.py b/modoboa/admin/models/domain.py
index 2dc24b73d..277db2d40 100644
--- a/modoboa/admin/models/domain.py
+++ b/modoboa/admin/models/domain.py
@@ -3,6 +3,7 @@
 from django.db import models
 from django.db.models.manager import Manager
 from django.utils.encoding import python_2_unicode_compatible, smart_text
+from django.utils.functional import cached_property
 from django.utils.translation import ugettext as _, ugettext_lazy
 
 from django.contrib.contenttypes.fields import GenericRelation
@@ -101,9 +102,15 @@ class Domain(AdminObject):
     def aliases(self):
         return self.domainalias_set
 
-    def is_in_dnsbl(self):
+    @cached_property
+    def dnsbl_status_color(self):
         """Shortcut to DNSBL results."""
-        return self.dnsblresult_set.blacklisted().exists()
+        if not self.dnsblresult_set.exists():
+            return "warning"
+        elif self.dnsblresult_set.blacklisted().exists():
+            return "danger"
+        else:
+            return "success"
 
     def add_admin(self, account):
         """Add a new administrator to this domain.
diff --git a/modoboa/admin/templates/admin/dnsbl_domain_detail.html b/modoboa/admin/templates/admin/dnsbl_domain_detail.html
index d68210708..e69e42f79 100644
--- a/modoboa/admin/templates/admin/dnsbl_domain_detail.html
+++ b/modoboa/admin/templates/admin/dnsbl_domain_detail.html
@@ -3,7 +3,7 @@
 {% load i18n %}
 
 {% block modalbody %}
-  {% if domain.is_in_dnsbl %}
+  {% if domain.dnsbl_status_color == "danger" %}
     <table class="table">
       <thead>
         <tr>
@@ -24,7 +24,12 @@
       </tbody>
     </table>
   {% else %}
+    {% if domain.dnsbl_status_color == "success" %}
     <div class="alert alert-success">
       {% trans "Everything is fine, this domain is not listed." %}</div>
+    {% else %}
+    <div class="alert alert-warning">
+      {% trans "No information available for this domain." %}</div>
+    {% endif %}
   {% endif %}
 {% endblock %}
diff --git a/modoboa/admin/templates/admin/domains_table.html b/modoboa/admin/templates/admin/domains_table.html
index c209dee64..c2a5b1de8 100644
--- a/modoboa/admin/templates/admin/domains_table.html
+++ b/modoboa/admin/templates/admin/domains_table.html
@@ -7,7 +7,7 @@
   <td name="tags">{% render_tags domain.tags %}</td>
   <td name="auth">
     <small>
-      <a href="{% url 'admin:dnsbl_domain_detail' domain.pk %}" data-toggle="ajaxmodal"><span class="label label-mini label-{% if domain.is_in_dnsbl %}danger{% else %}success{% endif %}">DNSBL</span></a>
+      <span class="label label-mini label-{{ domain.dnsbl_status_color }}"><a href="{% url 'admin:dnsbl_domain_detail' domain.pk %}" data-toggle="ajaxmodal">DNSBL</a></span>
     </small>
   </td>
   <td name="actions">{% domain_actions user domain %}</td>